Threaded electric fuse



June 1948. M. A. GARIBAY THREADED ELECTRIC FUSE- Filed Nov. 8, 1946 Au II-iinwl. all.

I 3mm Mafia/7209f. aarz'zraz/ MVM W Patented June 8, 1948 THREADED ELECTRIC FUSE Mariano Ahedo Garibay, San Pedro de los Pinos, Mexico City, Mexico Application November 8, 1946, Serial No. 708,549 In Mexico November 9, 1945 This invention relates to a threaded electric fuse, to be used in electric circuits as a protection against overloads, excessive voltages and the general purposes of a fuse of its kind.

An object of this invention is to provide a threaded electric fuse, specially designed for its use in home electrical installations, substituting with advantage all types of threaded electric fuses commonly used.

Another object of this invention is to provide a fuse of very simple design and construction using a minimum of materials, to obtain a low cost electric fuse, which may be replaced as many times as necessary, and which may be purchased in sufficient numbers, to avoid the dangerous custom of substituting coins, tin foil and other unsafe materials, placed in the fuse sockets for fuses.

A further object of this invention is to provide a threaded electric fuse, which makes impossible the substitution of the fusible material, which has been designed to provide the necessary protection against overloads, with any temporary and unsafe replacement, such as copper wires, or any other material not adequate for the particular electric circuit.

A further object of this invention is to provide a threaded electric fuse, which makes possible the quick examination of the conditions of the fusible material, for its replacement, if necessary.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claim.

In the drawing:

Figure 1 is a perspective view of the electric fuse, showing the construction of the flat supporting body.

Figure 2 is a bottom plan view of the fuse threaded in the fuse socket.

Figure 3 is a sectional view taken substantially on the line 3-3 of Figure 1.

Referring to the drawing, numeral I generally designates a flat supporting body, made of any adequate insulating material, preferably plastic, forming a thin elongated body, with an upper portion provided with small indentations II, to give a better support when screwing said threaded fuse in the corresponding socket of the fuse box.

This body I0 is provided in its lateral portions with a threaded section l2, corresponding to the threads of the socket 13, in which these lateral portions engage. Lateral portions I2, may be 1 Claim. (Cl. 200130) thicker than the supporting body [0, as to provide a more efficient contact and support to the walls of the socket 14.

Body I0, at one of its lateral portions is provided with a perforation [5, which extends from the middle lateral portion to the middle lower portion of said body ID.

The fuse material, usually a cylindrical body of material which fuses when heated by an excessive voltage or overload in the circuit, is located in perforation [5, so that the projecting ends of said fuse body l6, make contact with the electrodes of the socket where the fuse is threaded.

In order to provide a more eflicient electrical contact, these projecting ends of the fuse body It, are rounded or convenient shaped, to increase their contact surface.

Supporting body III, is also provided in its middle lateral flat portion, with a window or opening I], which is transversed by the fuse body [6, providing the means to observe the condition of the fuse, and to allow space for the fusion of said body I6. This window or opening [1, may be covered with a transparent heat insulated thin plate l8, such as mica.

The fuse body l6 may be of the ribbon type with a thinner or narrower portion at its fusing point. In any case this fuse body has rounded ends at the middle lower and lateral portions of the supporting body I0, which may be provided with small metallic sections for a better electric contact with the threaded walls of the socket.

The threaded electric fuse embodied in this invention, replaces and substitutes with advantage, the fuses now used in electrical installations. Due to its extreme simplicity, it greatly reduces the manufacturing costs. The construction and design of its lateral walls makes possible its use in standard fuse boxes, and the rounded ends of the fuse body and metallic pieces, assure a positive connection with the electrodes of the socket. Its main opening or window provides a space for the fusion of the material, as well as the means for observing the condition of the fuse, making it impossible to replace the fuse body or repair the fuse.

What I claim is:

A fuse comprising a flat solid body of nonconducting material, correlated notches formed on the opposite side edges of said body constituting segmental threads for said body longitudinally thereof, said body formed with a transverse opening therethrough, a pair of spaced apart transparent panels closing the opposite ends of 2,443,134 i o 3 4 said opening, a fusible element carried in said REFERENCES CITED body between the bottom edge thereof and one side edge, a contact member connected to said i l? ig g gg i fs are of record in the fusible element on the said bottom edge, a contact member connected to said fusible element along 5 UNITED STATES PATENTS one side edge, said fusible element extending di- Number Name Date agonallyraeross said opemng-between said trans- 13414;864 ,ZDaViS MM May 2 1922 parentf'pan'efs whereby the condition oi -said 1312;216L Hughsonm May 1933 fusible element may be readily viewed. 2,191,793 Jaedike 1940 MARIANO AHEDO GARIBAY; 10 7 

